摘要
采用水热法制备尖晶石CoFe_2O_4纳米颗粒,通过改变合成温度(140～200℃)和原料中钴的含量,借助X射线衍射仪、场发射扫描电子显微镜、透射电镜和振动磁强计等研究上述两个因素对合成颗粒结构、形貌及磁性能的影响,并从机制上加以解释。结果表明:水热法合成的CoFe_2O_4纳米颗粒平均粒径在30～40nm之间,提高原料中钴的含量有利于去除α-Fe_2O_3相;随合成温度的升高,该颗粒的饱和磁化强度持续增大,最高为59.694Am^2·kg^(-1),矫顽力先升后降,最高可达1273.28A·m^(-1)。
Spinel CoFe2O4 nanoparticles were synthesized by hydro-thermal method. The effects of synthetic temperature and Co contents in raw materials on the structure, morphology and magnetic properties of synthetic particles were studied by X-ray diffractometer, field emission scanning electron microscopy, transmission electron microscopy and vibration magnetometer, changing synthetic temperature （140- 220℃） and Co contents in raw materials, and the effects were explained in mechanism. The results show that the average grain size of CoFe2O4 nanoparticles synthesized by hydro-thermal method was between 30 nm and 40 nm. It was advantageous to raise Co contents in raw materials for removing a-Fe2O3 phase. The saturation magnetization of particles raised continually with the increase of the synthetic temperature and its maximum was 59. 694 Am^2 · kg^-1 , the coercive force raised first and dropped later and its maximum was 1 273.28 A · m^-1.
出处
《机械工程材料》
CAS
CSCD
北大核心
2011年第7期88-92,共5页
Materials For Mechanical Engineering
基金
国家自然科学基金资助项目(50703023)
教育部新世纪优秀人才支持计划项目(NCET-06-0396)
关键词
水热法
钴铁氧体
纳米颗粒
饱和磁化强度
矫顽力
hydro-thermal method
Co ferrite
nanopartiele
saturation magnetizatiom coercive force
